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December Weather in Monticello, United States

Last updated: June 24, 2025

During December, the average temperature in Monticello, United States hovers around 2°C (35°F). Expect chilling minima that can drop to -24°C (-10°F), while highs may reach up to 18°C (64°F). The region experiences an average precipitation of 62 mm (2.4 in) over about 9 days, accompanied by a notably high average humidity of 86%.

December Temperature in Monticello

In December in Monticello, the average temperature is 2°C (35°F), with maximums reaching 18°C (64°F) and minimums dropping as low as -24°C (-10°F). Travelers should be prepared for a wide range of temperatures and pack accordingly.

December Weather in Monticello: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Monticello, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Monticello, December typically has an average temperature of 2°C (35°F), with highs reaching up to 18°C (64°F) and lows dropping to around -24°C (-10°F).
JanFebMarAprMayJunJulAugSepOctNovDec283041516473777469574135
Data source: Temperature data for Monticello generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in Monticello

In Monticello in December, the precipitation amount is 62 mm (2.4 in) over the course of 9 days.

December Precipitation Trends in Monticello

The chart displays monthly precipitation patterns in Monticello, with values for each month alongside December’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how December’s conditions compare to those of other months. In Monticello, December typically receives around 62 mm (2.4 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec7477103971579799105611107462
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Monticello

In Monticello in December humidity is 86%. With an average temperature of 2°C (35°F), this humidity feels like a damp chill that seeps into your bones, making traveling quite uncomfortable as your clothes cling to you and the cold air cuts through any warmth you try to find.

December Average Humidity in Monticello

This chart illustrates the average monthly humidity levels in Monticello, with December’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In December, average humidity in Monticello is approximately 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%85%86%87%81%82%81%79%78%81%89%86%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Monticello

In Monticello in December, the maximum UV index is 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in Monticello, you can visit Hourly UV Index in Monticello.

Maximum UV Index Levels in Monticello for December

The chart shows the monthly maximum UV Index (UVI) for Monticello in December, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In December, the maximum UV index in Monticello typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910101098642
Data source: Monticello December UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How December Weather in Monticello Compares to Other Months

Weather in Monticello varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Monticello, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Monticello, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (29°F)74 mm (2.9 inches)85%moderate
February Weather-1°C (31°F)77 mm (3.0 inches)85%moderate
March Weather5°C (42°F)103 mm (4.0 inches)86%high
April Weather11°C (51°F)97 mm (3.8 inches)87%very high
May Weather18°C (64°F)157 mm (6.2 inches)81%very high
June Weather23°C (74°F)97 mm (3.8 inches)82%very high
July Weather25°C (77°F)99 mm (3.9 inches)81%very high
August Weather23°C (74°F)105 mm (4.1 inches)79%very high
September Weather21°C (70°F)61 mm (2.4 inches)78%very high
October Weather14°C (57°F)110 mm (4.3 inches)81%high
November Weather5°C (41°F)74 mm (2.9 inches)89%moderate
December Weather2°C (35°F)62 mm (2.4 inches)86%low

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